Ardence

~ the eulogy ~

Ardence sold a thing that sounds impossible the first time you hear it described and obvious about ten seconds later: a computer with no operating system on it, which fetches one over the network at power-on and runs normally. Not a thin client, not remote desktop. The machine does its own work with its own processor. It just does not keep anything.

The implementation was a device driver that mounted a virtual disk over a custom UDP protocol. You netbooted a small kernel containing that driver, the driver presented networked storage as a local disk, and Windows or Linux came up off it and never knew the difference. Any x86 box could be provisioned, or wiped and reprovisioned, from bare metal, which is why the customers were schools and call centers, places with hundreds of identical machines and a strong interest in never touching any of them individually.

Citrix announced an agreement to acquire the company on 20 December 2006 and closed it the following month. That purchase is the event most summaries treat as the ending, but the name outlasted it: Citrix shipped the enterprise streaming product under the Ardence badge for a while before renaming it. The actual disappearance came in July 2008, when a group of former Ardence executives bought the embedded software business back out of Citrix, took a minority investment from Citrix on the way out, and launched it as IntervalZero.

~ the dossier ~

~ venturcom first ~

Marc H. Meyer, Doug Mook, Bill Spencer and Myron Zimmerman founded VenturCom in 1980 and spent the decade on the problem of making Unix behave on small machines. Venix was theirs: a Unix for the IBM PC and the PC/XT, shipped when the idea that a desktop computer could run a real multiuser operating system was still an argument rather than an assumption.

That lineage explains the later products better than the marketing did. A company that spent twenty years on real-time extensions and operating system plumbing is exactly the company that ends up building a disk driver clever enough to lie convincingly to Windows. The rename to Ardence came in 2004, which was a reasonable decision commercially and still reads as a loss, because VenturCom was a name with twenty-four years of history attached and Ardence was a name with none.

~ booting from nothing ~

Engineers recognize the shape of this product immediately even when they have never bought one, and I am no exception. Diskless netboot is engineer territory and always has been. What I actually touched was PXE and plain network file systems on lab machines, the homemade cousin of what Ardence sold, and it worked about as well as homemade things do.

What Ardence sold was that idea made reliable enough to put a bank on, and the price of reliable was that only institutions bought it. There was never a consumer edition. There was never a free tier. You encountered this software because your employer or your university had deployed it, and if it was working properly you did not encounter it at all.

~ two halves, two owners ~

Citrix kept the enterprise streaming technology, which it had wanted all along, and folded it into its provisioning line where the code still lives under other names. The embedded and real-time half was the part Citrix had no use for, so its original engineers bought it back. IntervalZero still ships RTX64, a real-time extension for Windows descended directly from the VenturCom work of the 1980s.

So the technology is forty-six years old and still shipping, on its third owner, while the word Ardence itself lasted four years somewhere in the middle of that. ardence.com now belongs to an unrelated company that uses the word for an AI investigation product, which is how a short, pretty, abandoned name gets reused.

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